Document: add PLAT_PL061_MAX_GPIOS define
ARM PL061 GPIO driver requires the "PLAT_PL061_MAX_GPIOS" definition.
By default, it's defined to 32 in PL061 GPIO driver. If user wants
more PL061 controllers in platform, user should define the build
flag in platform.mk instead.

Signed-off-by: Haojian Zhuang <haojian.zhuang@linaro.org>
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@Haojian Zhuang Haojian Zhuang authored on 3 Feb 2016
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docs/porting-guide.md